#include <M5StickCPlus.h>
// select the input pin for the potentiometer
int ir_recv_pin     = 33;
int ir_send_pin     = 32;
int last_recv_value = 0;
int cur_recv_value  = 0;

void setup() {
    M5.begin();
    M5.Lcd.setRotation(3);
    pinMode(ir_recv_pin, INPUT);
    pinMode(ir_send_pin, OUTPUT);
    // send infrared light
    // now, you can see the infrared light through mobile phone camera
    digitalWrite(ir_send_pin, 1);
    // M5.Lcd.setTextSize(2);
    M5.Lcd.setCursor(0, 0);
    M5.Lcd.print("Test for IR receiver: ");
}

void loop() {
    // now, once you press the button on a remote controller to send infrared
    // light the screen will display "detected!"
    cur_recv_value = digitalRead(ir_recv_pin);
    if (last_recv_value != cur_recv_value) {
        M5.Lcd.setCursor(0, 25);
        M5.Lcd.fillRect(0, 25, 150, 25, BLACK);
        if (cur_recv_value == 0) {  // 0: detected 1: not detected
            M5.Lcd.print("detected!");
        }
        last_recv_value = cur_recv_value;
    }
    Serial.println(cur_recv_value);
    delay(100);
}
